China Shenzhen Wofly Technology Co., Ltd. Company News

  WOFLY has more than 10 years of experience in manufacturing air boxes, gas cabinets, gas manifolds, and gas panels for various industrial applications. By cooperating with the diversified companies in all walks of life, we found that "box" and "gas cabinets" these two terms can be interchangeable.   From the initial design phase to manufacturing and delivery, our experienced engineers and supply chain experts will directly cooperate with customers and materials suppliers. The gas box includes not only the gas itself, but also includes a control device and a metal plate to protect the gas panel and the surrounding environment. There is also space in the air cabinet and a cylinder. The gas tank protects people from potentially harmful gases. We take all precautions to ensure that the gas tank is manufactured according to the precise specifications of manufacturing operations while ensuring that materials and components suitable for each gas characteristic.   With the advancement of various industries such as medical equipment, semiconductors and alternative energy sources, the demand for high quality and complete gas delivery systems is increasing. The gas box can provide a centralized position of the cylinder and regulator for your team because the pipe pushes the gas to the output position of the plurality of workstations. There is a concentrated gas system that allows you to better control gas output, rate and pressure. We can provide you with gas delivery systems while ensuring that the entire system is designed, designed, assembles and tested by our team. After receiving, the air box can be installed.   The gas panel is based on customer order specifications and design. With internal engineering and design capabilities, we help our customers determine the correct gas panel type based on the tasks they want, and then build the valve, regulator, pipe, control device, etc. you need. The gas plate can be mounted in the gas tank or can also be independent of the gas tank / gas cylinder. Gasboard is a relatively simple     Gas cabinet safety In order to solve the problem of gas cabinet safety, it also provides a centralized delivery system, the gas cabinet and the gas cabinet can provide an effective way to deliver the appropriate amount of gas to each workstation. In addition, the implementation of these systems can make it easier to perform gas cylinders to reduce interference between production workshops and reduce the amount of cylinders that occupy space. Here are some of the features you can choose to use in the gas cabinet, as well as the safest gas delivery component type:   1. Corrosive gas can make other materials or destroy when contacting or present. These gases also stimulate and damage the skin, eyes, lungs or mucosa. If any inorganic material or water in the OEM's working environment may penetrate the gas cabinet, the gas delivery system should be equipped with a hydrophobic valve and a check valve to prevent water and other materials from being sucked into any corrosive gas cylinder. gas. In addition, manufacturers should develop security policies, requiring workers to wear protective clothing and equipment while replacing cylinders and set up eye-catching and bathing stations.   2.Toxicity and toxic gases can be unviovive, flammable, oxidized, reactive and high pressure. Their toxicity will be based on a particular gas. A problem that needs to be solved is designed using one of the gas cabinets in which the gas is designed is to replace the potential leakage of toxic gases during the replacement of the cylinder. Whenever the worker is laid in the pipe, it may leak into the room when the worker opens the cylinder valve. The purge valve system designed in the gas cabinet can remove toxic gases in the pipe manifold. You can use an inert gas purge line.   3.The oxidant gas has combustion capabilities, but it is not burn like a typical flammable gas. In addition to O2 gas, this type of gas can replace the oxygen present in the room. Therefore, the manufacturer should keep all flammable materials away from the gas cylinder. The gas delivery system is completely closed, with a small repair panel, and people can enter against the valve. Oxidative gas uses a specially designed regulator and has a label, which is written to the O2 gas service and cleaned.     4.The temperature of the low temperature gas can reach the boiling point of the negative 130 degrees. This extreme cold will significantly degrade many materials to make them brittle and increase their possibility of rupture under high pressure. Blocking in the line can also cause temperature fluctuations, and the temperature rise will cause the pipe to accumulate due to pressure accumulation. When designing the gas cabinet for these gases, the safety barrier valve and exhaust pipe are good choices.   5. flammable gases are often used in the semiconductor industry. These gases can spontaneously explode or fire without any material. Some of the fireless gases can also release a large amount of thermal energy. When designing the gas cabinet for these gas, the manufacturer must adopt a preventive measures as the flammable gases. This includes a deflation valve, a vents, and a flashfirer for conveying the system.

  High-pure stainless steel pipes are used in the application areas: high purity and ultra-high purity gases, flammable and explosive gases, poisonous gases such as special gas pipeline systems, secondary pilot, and other gas equipment.   In the process of stainless steel smelting materials, about 200 g of gas can be absorbed per ton. The stainless steel is processed, not only the surface is adhesive, but also a certain amount of gas is also affected in its metal lattice. When there is air flow in the pipeline, this part of the gas resides in the metal will re-enter the airflow, and pollute the pure gas. When the intractive gas flow is discontinuous, the pipe is adsorbed under pressure to form the gas, and the gas is stopped by the gas stream, and the gas adsorbed by the tube has formed a step-down analysis, and the parsed gas is also used as impurities into the pure gas in the pipe. At the same time, adsorption, analyze, so that the surface of the pipe also produces a certain powder, which is also a purified gas in the tube. This feature of the pipe is critical, in order to ensure the purity of the gas delivered, not only requires a very high smoothness of the inner surface, but also high wear resistant characteristics. High pure gas pipe technology is an important part of the high-purity gas supply system. It is a key technique that can be sent to high purity gas to the gas supply to the gas point. The so-called high purity air pipe technology includes systematic Correct design, pipe fittings and accessories, construction installation and test testing. In particular, some of these gases such as SiH4 self-combustion, as long as one leaks will react vigorously with oxygen in the air, start combustion; and ASH3's vicinity, any micro leaks may cause the harm of people's life, that is Because these obvious hazards, the requirements for system design security are particularly high. When the gas is strong in corrosion, it is necessary to use the corrosion-resistant stainless steel tube. Otherwise, the pipe will produce      The connection of high flow of high traffic, high-purity gas transmission pipeline is in principle, in principle, welding, requiring pipes, and tissue does not change during welding. When the carbon containing too high is welded, the gas permeation of the welded portion such that the internal and external gas is penetrated, destroying the purity, dryness and cleanliness of the delivery gas, resulting in all the efforts of our efforts. In summary, for high purity gas and special gas delivery pipes, a high-purity stainless steel pipe for special treatment is required to make high purity pipe systems (including pipes, tubers, valves, VMB, VMP) in high purity gas distribution. It has a vital mission.    

  All high purity, high purity in the clean nitrogen pipe is required to be delivered to the instrument (POU) through the pipeline. In order to achieve the quality requirements of the instrument, in the case of gas outlet indicators, it is necessary to pay more attention to the pipe system, material selection and construction quality. In addition to the accuracy of the gas or purification equipment, it is largely affected by many factors of the pipeline system. Therefore, the selection of pipes should abide by the relevant industry principles, and indicate the pipeline material.     The material of the clean nitrogen pipeline is selected according to the needs of the use, and the 316L BA is commonly used in contact with the chip but does not participate in the process reactive. The surface roughness in the tube is a standard for measuring the quality of pipe. The lower the roughness, the particle carrying possibilities are greatly reduced. Clean nitrogen pipelines can absorb about 200 g of gas per ton during the stainless steel smelting material. The stainless steel is processed, not only the surface is adhesive, but also a certain amount of gas is also affected in its metal lattice. When there is air flow in the pipeline, this part of the gas resides in the metal will re-enter the airflow, and pollute the pure gas. When the intractive flow of the tube is not continuous flow. When the pipe is adsorbed under pressure, the gas is adsorbed, the gas is stopped, and the gas adsorbed by the pipe has formed a step-down analysis, and the parsed gas is also used as impurities into the pure gas in the pipe. At the same time, adsorption, analyze, so that the surface of the pipe also produces a certain powder, which is also a purified gas in the tube. This feature of clean gas pipeline is critical, in order to ensure the purity of the gas delivered, not only require a very high smoothness of the inner surface, but also high wear resistant characteristics.     When the gas is strong in corrosion, it is necessary to use the corrosion-resistant stainless steel pipe. Otherwise, the pipe of clean gas pipeline will generate corrosion spots due to corrosion, and there will be large metal stripping or even perforation, and thereby pollution Pure gas with a pure gas.

  1.Features of the laboratory air supply system:   1.1 Features: The laboratory requires a constant carrier gas flow, high gas purity, and provides a gas for analyzing equipment for the laboratory to provide quantities and stable gas. 1.2 Economic: Building a concentrated gas cylinder can save limited laboratory space, do not need to cut off when replacing the cylinder to ensure continuous supply of the gas. Users only manage fewer cylinders, pay less steel bottle rent, because all used points used in the same gas come from the same gas source. Such a supply method will ultimately reduce transportation, reducing the amount of retarding gas in the air bottle of gas company, as well as good cylinders management. 1.3 usage: Centralized pipe supply system can place gas outlets in use, such a more reasonable design workplace. 1.4 security: to ensure its storage and use of security. Safeguards the analysis tester from being infringed by the toxic and harmful gases in the experiment.   2. Hazard of laboratory gas   2.1 Some gases have flammable, explosive, toxic, strong corrosion, etc., once they leak, may cause harm to staff and instrument equipment.   2.2. A variety of gases are used in the same environment. If there are two gases that have strong chemical reactions such as combustion or explosions, they may cause injury to staff and instrument equipment. 2.3 Most of gas cylinders are up to 15MPa, namely 150 kg / cm2, if the air bottle decompression device is out of the decompression device, it is possible to eject some parts, and its energy has fatal injury to the human body or equipment. .   3.Conditions and preparations for craft pipe test pressure   The pipeline system is completed and compliant with the design requirements and regulations. The branch, the hanger and the pipe rack are finished, and the ray flaw detection has completely reached the design specifications, and the part of the test, weld and other should be tested is not painted and incubated. The test pressure gauge has been verified, the accuracy is set to 1.5, and the full scale value of the table should be 1.5 to 2 times the maximum pressure measured. Before the test, the test system, equipment and attachments will not be involved in the test system, and the position of the blind board is used to apply the white lacquer lacquered mark and record. The test water should be used with clean water, and the chloride ion content in the water must not exceed 25 × 10-6 (25 ppm). The temporary pipeline for the test is reinforced, and the safety and reliability should be checked. Check if all valves on the pipe are on the open state, whether the spacers are added, and the retracting valve core is to be removed, and after the purge can be reset.

  The main purpose of the electronic special gas cabinet is to safely transport special gas; No external pollution and fine particles in the gas in the filter through the filter. The main requirements of the main requirements are safety, and the main risk of special gas cylinders is that there is a harmful gas in the case of the cylindrical cylinder valve without being killed or the pipeline; (2) After converting the cylinder joint after the bottle (the pig tail lineage joint ) Not connected, causing the gas overflow when opening the bottle. The following is detailed by Woy Fei Technology, with the safety requirements for special air cabinet cylinders.   Special gas cabinet cylinder safety operation procedures: 1. Non-experimental persons are strictly prohibited from contact with gas cylinders and related valves. 2. It is strictly forbidden to hit the impact during operation, pay attention to the pressure gauge reading, regularly check the valve and pipeline to ensure no leakage. 3. When replacing, make sure the new gas bottle is clear and complete; during the handling process, it should be lightly put it. Only when the gas cylinder is stable, you can let go. 4. The cylinder should be stored in a cool, dry, away from the heat source, and place the ground of the gas cylinder must be flat, the safety cap on the cylinder should be tightened to protect the valve. Do not turn it. 5. When using a nitrogen bottle, the bottle valve is used first, and then the decompression adjustment screw slowly rotates the gas out. Use the PP gas bottle valve, and turn out the pressure in the pressure reducer, then remove the decompression air conditioner screw.     Special gas cabinet cylinder storage safety requirements: 1. It should be placed in a special warehouse storage, and the gas cylinder warehouse should comply with the relevant provisions of the "Building Design Fire Prevention Specification"; 2. There is no gutter in the warehouse, dark road, strictly forbidden to open fire and other heat sources, in the warehouse should ventilate, dry, avoid direct sunlight; 3. Control the temperature in the warehouse, specify the storage period; 4. It is strictly forbidden to heating the gas cylinder with a heat source of more than 40 ° C; 5. The gas cylinder should be properly equipped with a bottle cap. When putting the place, it should be properly fixed; when it is placed, the head is in the same direction; 6. Confirm the steel printing and color tag of the gas cylinder, confirming gas cylinders that do not meet the safety technical requirements; 7. Empty bottles are inspected, and the gas in the bottle is not exhausted, and there must be remaining pressure; the remaining pressure of the gas cylinder should not be less than 0.05 MPa. 8. Cylinder bottle shoulders have the specific time of the next test, which can be put down this time. It is time to send to specialized testing mechanism tests to be bottle. It is generally two years to detect once. 9. The empty bottle should be placed separately and have obvious signs; with toxic gas cylinders and bottle gas can cause combustion, explosion, gas cylinders that produce poisons, and store them in the vicinity of gas utensils or Fire extinguishing equipment; The special gas cabinet mainly used special gases, such as flammable, explosive, highly toxic, etc., mainly for semiconductors and LEDs.    

  Single station system - In some applications, gas is only used to calibrate the instrument. For example, a continuous emission monitoring system (CEMS) only need to calibrate the gas for a few minutes a day. This application clearly does not require a large-scale automatic conversion manifold. However, the design of the delivery system should prevent the calibration gas from being contaminated and minimizes cost related to the replacement of the cylinder. Single-way manifold with brackets is an ideal solution for such applications. It provides a safe and efficient connection and replacement of cylinders, without struggle with the regulator. When the gas contains a corrosive component such as HCl or NO, a purge assembly should be mounted in the manifold to purge the regulator with an inert gas (usually a nitrogen) to prevent corrosion. Single / station manifold can also be equipped with a second tail. This arrangement allows access to additional cylinders and keeps standby. Switching is manually accomplished using the cylinder cutoff valve. This configuration is usually suitable for calibrating gas because the precise mixing of the ingredients usually varies from cylinders. Semi-automatic switching system - Many applications need to be used continuously and / or larger than the amount of gas actually used by single-station manifold. Any suspension of gas supply can cause experimental failure or destruction, productivity loss or even the entire facility downtime. The semi-automatic switching system can switch from the main gas bottle or spare gas cylinder without interrupting, minimizing the cost of high downtime. Once the gas bottle or cylinder group consumes exhaust, the system automatically switches to the spare gas cylinder or the cylinder group to obtain a continuous gas flow. The user then replaces the gas bottle as a new cylinder, while the gas still flows from the reserve side. The two-way valve is used to indicate the main side or the spare side when replacing the cylinder.    

  The centralized gas delivery system is actually necessary when a large amount of gas is used. A well-designed delivery system will reduce operating costs and improve productivity and enhance safety. The centralized system will allow all cylinders to be merged into a storage location. Centralize all cylinders to simplify inventory control, simplify and improve steel bottled. Gas can be separated according to type to improve safety. In a centralized system, the frequency of replacing the cylinder is lowered. It is achieved by connecting multiple cylinders to the manifold in the group, so a group can safely exhaust, supplement, and purge, while the second group provides continuous gas services. This type of manifold system can supply gas for a variety of applications or even the entire facility without having to equip each use point. Since the cylinder switching can be done automatically by the manifold, a row of gas cylinders will be even exhausted, thereby increasing gas utilization and reduces cost. Since the cylinder replacement will be carried out in isolation, controlled environments, the integrity of the delivery system will be better protected. The gas manifold used in these systems should be equipped with a check valve to prevent gas reflow and clear assemblies from eliminating the replacement of contaminants into the system. In addition, most gas delivery systems can be configured to indicate when to replace the cylinders or gas cylinders. Purity The gas purity level required for each use point is extremely important to design gas delivery systems. The gas purity can be simplified using a centralized system as described above. The choice of construction materials should always be consistent. For example, if you use a research grade gas, all stainless steel structures and no membrane sealing shut-off valves should be used to eliminate the pollution of the airflow. In general, the purity of three levels is sufficient to describe almost all applications.   The first stage, is commonly described as multi-purpose applications, with the least stringent purity requirements. Typical applications may include welding, cutting, laser assist, atomic absorption or ICP mass spectrometry. Manifold for multi-purpose applications has been economically designed to ensure safety and convenience. Acceptable building materials include brass, copper, TEFLON®, TEFZEL® and VITON®. Fill valves, such as needle valves and ball valves, are typically used to cut off flow. The gas distribution system manufactured at this level should not be used with high purity or ultra-high purity gases. The second level is called high-purity applications that require higher levels of anti-pollution protection. Applications include laser resonant cavity gases or chromatography, which uses capillary columns and system integrity is important. The structural material is similar to the multi-purpose manifold, and the flow cutoff valve is a diaphragm assembly to prevent contaminants from spreading into the airflow.     The third stage is called ultra-high purity applications. This level requires the components in the gas delivery system to have the highest level of purity. Trace measurements in gas chromatography are an example of ultra high purity applications. This level of manifold must be selected to minimize the adsorption of trace components. These materials include 316 stainless steel, TEFLON®, TEFZEL® and VITON®. All pipes should be 316sss cleaning and passivation. The flow shutoff valve must be a diaphragm assembly. Recognizing that components suitable for multi-purpose applications may adversely affect the results of high purity or ultra-high purity applications, this is especially important. For example, the exhaust gas of the neoprene diaphragm in the regulator can lead to excessive baseline drift and unsolved peaks.  

  1. Whether design is standardized to check Design is the main basis for engineering construction, and some professionals have strictly reviewed design specifications. To maximize the restrictions on the restrictions such as designer's ability to limit, the construction environment is limited, resulting in a large amount of change in the field pipeline installation, causing insufficient argument, not accurate design, and the drawings are incomplete. 2. Construction team staff qualification review must be strict Because the phenomenon of the guarantee is absolutely avoided, some construction teams do not have a strict restrictive organizational system, some people have unlicensed laid. At the same time, even a professional team, there are also causes of personnel flow replacement, technical update, and highlight the phenomenon of employee professional technical quality. In particular, the proportion of special operations in the pipeline installation must have a strict control review of the qualifications of the construction team.       3. The construction management standard for pipeline installation is high. If the prefabrication of the pipe should be well-organized. Such a precious metallic material such as the Harfa alloy, aluminum materials and the surface anti-pollution requirements of the pipeline, such as directly on site construction, focusing on the management of protection measures and environment; for the pipeline between the combined equipment, by equipment manufacturers According to the equipment positioning situation in the factory, there is a special structure of the strict jacket, and the pipelines are required to have special structures in the pipeline should be considered for the entrustment of manufacturers with mechanical processing qualifications. At the same time, to avoid pipe installations are not in place, so that the construction site is confusing, resulting in damage, and does not occur in standard materials.

Under normal circumstances, the substances used in the experiment are toxic, so there is a lot of safety hazards in various parts and related ventilation lines in the ventilator. This requires us to determine the elimination risk factor before implementing various inspections and maintenance. Any staff engaged in maintenance inspections must protect equipment such as masks, protective masks, protective glasses, acid-based gloves, etc.). In the process of experiment, if there is a dangerous condition, we must immediately eliminate the danger to continue to maintain the wind cabinet. In the chemical experiment, there is often a variety of unpleasant, corrosive, toxic or explosive gases. If these harmful gases are not in time to exclude outdoor, they will cause indoor air pollution, affect the health and safety of experimental personnel; affect the accuracy and service life of the instrument equipment. Air Flow Window of Laborary 1. dedicated to maintain laboratory fume hood main material, regular cleaning, multi-wiping, keep the plate surface clean. 2. a smooth surface countertops available epoxy flannel wipe clean, dry cloth or wipe light. 3. the surface of solid physiochemical board table mild hot water is recommended, acetone or cleaning properties cleaning ingredients do not use abrasive cleaner, to avoid damage to the table. For stubborn stains, contamination may be hypochlorous acid droplets in the experiment table plate can be washed away with water after 1.5 minutes. 4. paint spraying and then use the portion of the cleaning solution to clean the fine quality, to avoid contact with sharp objects leave scratches, must not be sanded to be noted that the holding surface of the dry everyday situations. 5. pp plastic materials and cleaning agents should first be sprayed on the surface, and then scrub brush moistened sparingly water until surface dirt was completely cleared, then wiped clean towel-dry soil. Detergent dilution ratio severity visible dirt, are generally to be made lean to rich. 6, maintenance of stainless steel materials 6.1. The laboratory ventilator should avoid using a detergent containing bleached ingredients and abrasives, and wireball 'grinding tools, and the like. In order to remove the detergent, the surface is rinsed with clean water at the end of the detergent. 6.2. Trademarks of stainless steel surfaces, film films, such as washing, binder ingredients, use alcohol or organic solvent (ether, stupid). 6.3. If there is a variety of acid surfaces, it is immediately rinsed with water, and then dried with aqueous ammonia solution or a neutral carbonate. 7. the maintenance of the attachment, the attachment mainly includes hinges, screws, handles, etc., which are generally sprayed with stainless steel or steel surface, and the spray treatment is mainly in use. You should pay attention to the following points: 7.1. avoid salt, acid, base, etc., directly on it, if it is accidentally happened, washed with water and wipe it with a dry cloth. 7.2. door hinges should be treated regularly and prevent long-term moisture. 8. keep the sewers are smooth and prevent clogging. 9. the sink and the countertops should be kept clean, such as water stains, apply rag to dry. 10. pay attention to the use of materials such as hoses, sealing materials.

1. Features of the laboratory air supply system: 1.1 Features: The laboratory requires a constant carrier gas flow, high gas purity, and provides a gas for analyzing equipment for the laboratory to provide quantities and stable gas. 1.2 Economic: Building a concentrated gas cylinder can save limited laboratory space, do not need to cut off when replacing the cylinder to ensure continuous supply of the gas. Users only manage fewer cylinders, pay less steel bottle rent, because all used points used in the same gas come from the same gas source. Such a supply method will ultimately reduce transportation, reducing the amount of retarding gas in the air bottle of gas company, as well as good cylinders management. 1.3 usage: Centralized pipe supply system can place gas outlets in use, such a more reasonable design workplace. 1.4 security: to ensure its storage and use of security. Safeguards the analysis tester from being infringed by the toxic and harmful gases in the experiment. 2. Hazard of laboratory gas 2.1 Some gases have flammable, explosive, toxic, strong corrosion, etc., once they leak, may cause harm to staff and instrument equipment. 2.2. A variety of gases are used in the same environment. If there are two gases that have strong chemical reactions such as combustion or explosions, they may cause injury to staff and instrument equipment. 2.3 Most of gas cylinders are up to 15MPa, namely 150 kg / cm2, if the air bottle decompression device is out of the decompression device, it is possible to eject some parts, and its energy has fatal injury to the human body or equipment. .

  The gas mixer is an important part of the factory centralized gas supply. It has more and more people recognize its importance, stable and accurate protective gas can improve the quality of the weld, and reduce the number of defective products. Save the production cost of the factory and improve economic benefits.   At the same time, the gas mixer is also a very convenient device. After the installation is installed, it is generally available in eight to ten years. The gas mixer is durable, and it is still necessary to pay attention to it during use. 1. The gas mixer is placed at a horizontally ground to avoid vibration. 2. Gas mixers should keep drying and clean 3. When the gas mixer does not use the gas mixer, turn off the input valve to prevent the input pressure from being over, damage the internal parts. 4. The input pressure of the gas should be within the specified range, and the range of the gas ratio and output traffic may not be used. 5. It is forbidden to use corrosive gases when performing gas ratio 6. During use, pay attention to observing whether the gas distribution cabinet has a phenomenon. 7. If the comparator fails, if the matching value is offset, the output traffic is unstable, do not disassemble,  

1.Conditions and preparations for craft pipe test pressure The pipeline system is completed and compliant with the design requirements and regulations. The branch, the hanger and the pipe rack are finished, and the ray flaw detection has completely reached the design specifications, and the part of the test, weld and other should be tested is not painted and incubated. The test pressure gauge has been verified, the accuracy is set to 1.5, and the full scale value of the table should be 1.5 to 2 times the maximum pressure measured. Before the test, the test system, equipment and attachments will not be involved in the test system, and the position of the blind board is used to apply the white lacquer lacquered mark and record. The test water should be used with clean water, and the chloride ion content in the water must not exceed 25 × 10-6 (25 ppm). The temporary pipeline for the test is reinforced, and the safety and reliability should be checked.Check if all valves on the pipe are on the open state, whether the spa 2. Process pipeline test 2.1.Pipe test pressure is 1.5 times the design pressure. 2.2. When the pipeline and equipment are tested as a system, the test pressure of the pipe is equal to or less than the test pressure of the device, and the test pressure of the device is not less than 1.15 times that of the pipe design pressure, and can be tested according to the test pressure of the equipment. 2.3.When the system is injected, the air should be exhausted, the air discharge point should be the highest point of the pipeline, and add a exhaust valve. 2.4. For pipelines with larger differences, the static pressure of the test medium should be measured in the test pressure. The test pressure of the liquid pipe should be subject to the pressure on the highest point, but the lowest point pressure must not exceed the tube components. 2.5. When the pressure is pressed, the boost should be slow, and after the test pressure is reached, it is regulated for 10 min, and there is no deformation without leakage. The test pressure drops to the design pressure, stops 30 minutes, and the pressure does not fall, no leakage is qualified . 2.6. After the test, the blind plate should be removed in time, and the water is placed, and the negative pressure should be prevented when drained, and it should not drain the water. When the leak is found during the test, it should not be processed, after eliminating the defect, it should be re-examined. 2.7. The leakage test was performed after the pressure test was passed, and the test medium used compressed air. 2.8. Leakage test pressure is designed to design pressure, leak test should focus on checking the filler, flange or threaded joints, vent the valve, exhaust valve, drainage valve, etc., with the foaming agent inspection without leakage. 3. craft pipe purge and cleaning 3.1. Process technology requirements 3.1.1. Process pipeline should be segmented and cleaning (referred to as purging). 3.1.2. The blowing method is determined according to the requirements of the use of the pipeline, the dirty procedure of the surface of the working medium and the inner pipe is determined, and the hair drying sequence is generally carried out in accordance with the supervisor, branch pipe, and discharge tube. 3.1.3. Before blowing, the instrument within the system should be protected and remove the orifice plate, the filter adjustment valve and the retracted valve body, etc., properly, and the like. 3.1.4. When purging, the dirt in the pipe should not enter the equipment, and the dirt blown out of the device shall not enter the pipe, the valve flange is added. 3.1.5. Pipe purging should have sufficient flow, and the purge pressure must not exceed the design pressure, and the flow rate is generally not less than 20 m / s. When purging, apply a wood hammer to beat the tube, and focus on the weld and the bottom of the pipe, but must not damage the pipe . 3.1.6. Pipe branch should be considered before blowing, and the rigging of the hanger should be reinforced when necessary. 3.2. Pipe purification, cleaning method 3.2.1. Water rinsing: Working medium is the pipeline of the water system. Water rinsing may reach the maximum flow rate or not less than 1.5 m / s in the tube. It is qualified for export water and transparency with the entrance. After the pipe is rinsed, the water should be exhausted in time. 3.2.2. Air purging: Working medium is gradually purged with compressed air segments for gas pipelines. If you meet the valve, you must remove the front flange to the docking board, and then reset it after the pipe is blown. The pressure must not exceed the container and pipe design pressure, and the flow rate should not be less than 20 m / s. During the air purge, when the exhaust gas is not smoking, the exhaust port is placed in the exhaust port to test the lacquered wooden target, and there is no rust, dust, moisture, and other debris on the target plate in 5 min. 3.2.3. Steam purge: The working medium is purged with steam in the steam pipe. Steam is purged before the warm tube should be slow, then naturally cool down to ambient temperature, then lift the warm tube, carry out the second purge, so repetition is generally not less than three times. The exhaust gas in the vapor purge is tilted upwards, and the mark is eye-catching. The exhaust pipe diameter should not be less than the diameter of the purge tube. Qualified standard: Double replacement targets for two consecutive times, such as the spots visible to the naked eye on the target plate size below φ 0.6mm, the depth of depth is 1 / cm2; the purge time is 15 minutes (ie two In the case of a pass, it is passed.